MgO对中钛型高炉渣矿相结构及冶金性能的影响

Influence of MgO on mineral structure and metallurgical properties of blast furnace slag with medium titanium

采用偏光显微镜对不同MgO质量分数（7%～16%）条件下中钛型高炉渣的矿相结构进行研究。结果表明,炉渣显微结构为斑状结构、似斑状结构;矿物组成主要为巴依石、黄长石,其次为尖晶石、钙钛矿、钛辉石,少量的金属铁、氮化钛、碳化钛及其固溶体;随着MgO质量分数的增加,炉渣中钙钛矿及巴依石质量分数先降低后升高,钛辉石质量分数逐渐升高,而黄长石质量分数先升高后降低;当Mg O质量分数达到14%时,出现了第一期尖晶石这种高熔点化合物,会导致炉渣的黏度和熔化温度升高,炉渣的流动性变坏。该研究成果对改善中钛型高炉渣的流动性能具有重要指导意义。

The mineral structure of blast furnace slag containing medium titanium with different mass percent of MgO（7%-16%） was studied by means of polarization microscope.The results show that the texture of the slag was porphyritic.the mineral compositions are mainly the rich titanium diopside and melilite,followed by spinel,perovskite,titanaugite,and finally a little of metallic iron,titanium nitride,titanium carbide and their solid solution. As the mass percent of Mg O increased,the content of the perovskite and the rich titanium diopside reduced first and then increased,the contents of the titanaugite increased gradually and the contents of the melilite increased first and then decreased. When the mass percent of Mg O reached 14%,The first phase of the high-melting spinel appeared,which resulted in higher voscosity and melting temperature of blast furnace slag,and the liquidity of blast furnace slag also became worse. The above results have a vital guiding significance on improving the liquidity of blast furnace slag with medium titanium.